Snubbed truck



Aug. 29, 1950 A. LEHRMAN ETAL SNUBBED TRUCK Filed Feb. 5, 1945 5 Sheets-Sheet 2 INVENTORS. QZSO @S///Wzfav @df Aug- 29, 1950 L. A. LEHRMAN ETAL 2,520,845

SNUBBED TRUCK Filed Feb. 3, 1945 3 Sheets-Sheet 5 INVENTORS. 50 QZ/wzmz/ Patented Aug. 29, 1950 UNETED STATES PATENT OFFICE SNUBED TRUCK Leo A. Lehrman and Herbert J. Schmid, Chicago,

Ell., assignors to `imericamnv Steel Foundries, Chicago, Ill., a corporation of New Jersey Application February 3, 1945; Serial No. 575,978

20 Claims. l-

Our invention relates to railway carv trucks and more particularly such a type of truck wherein snubbin'g means is mounted in each end 0i the bolster for cooperation withl friction plates or panels on the adjacent side tramev columns` The general object of our invention is to devise such a truck wherein the friction means may beso mounted' in the end of the bolster as to pro-` vide adequate snubbing eiect of the. coil springs on which the bolster may besupported from the side frame, said' snubbing parts being so con-n structed and arranged as to facilitate their mountingin the bolster in engagement with the side frame columns andto aiord satisfactoryfwear conditions'.

A' more speciic object of' our invention is to? devise a snubbed truck inv which a pair of spaced friction shoes ymayy be mounted in each side of each bolster end and resilient means may be so associated with the shoes Within the bolster as to cause the shoes to bear' against spaced 'walls ot the bolster and against the adjacent columns. Qur novel arrangemeht contemplates a friction shoe assembly comprising top and bottom bisymmetrical' shoes with adjacent cavities within whichr may bel vulcanized a resilient' member serving to retain the shoes in proper relation to each other and under certain'operating conditions reacting against the shoes for purposes more clearly set forth hereinafter. v`

In both modifications we have illustrated; each side of the bolster end is constructed with spaced wedge surfaces along which the respective shoesy of each pair may seat and have some slidingr movement to permit satisfactoryl bearing against the adjacent side frame column.

In the drawings:

Figure l is a fragmentary side elevation of a railway car truck embodying our invention,1partL ly in section, the section being taken'appro'Ximately in the vertical plane bisecting the side frame longitudinally as' indicated'by the line I-I1 of Figure 2;

Figure 2 isa fragmentary top plan View'. of the structure shown in Figure 1, also partly in sec*a tion, the section being taken approximately 'in the horizontal planes indicated by thel line' 2;-2 of Figure l;

Figure 3 is aV fragmentary topv plan view-of a: portion of the bolster structure illustrating ther shoeV pocket, and Figure 4i is a section through the' shoe pocket portion of the bolster, taken approximately in the vertical plane indicated' by the line Iiitof Figurel 3;

Figure 5 isa fragmentary side elevationf view (Cl..i (l5-`-197) of the bolster structure, looking into the shoe pocket, the View being taken appoximately in the plane indicated.V by the line 5-5 of Figure 2;

Figures 6, 7, and 8 illustrate our novel form of` friction shoe utilized' in the structure shown in Figuresv 1 and 2, Figure 6 being a plan view taken from the inner face of the shoe Figure l an end' View looking upwardly at the bottom of Figure 6, and Figure 8` a side elevation viewed from the lett of Figure 7;

Figure 9. is a fragmentary sectional View through a. railway car truck illustrating a modified' formoi our invention, the View being in section. and comparable to the sectional View of Figure 1 and being taken approximately in the longitudinal vertical plane bisecting the side frame asv indicated by the line 9 9' of Figure l0;

Figure I0' is a iragmentary top plan View of the bolster andk friction shoek assembly illustrated in Figure 9, the side. frame being omitted;

Figure l1 i's a sectional vie-w through the structure shown in Figures 9 and 10, the section being. taken approximately in. the transverse vertical planes indicated by the line ll-ll of Figure 10;." and Figures 12,113., and 14 show` the detail of our novel form of.- friction shoe utilized inthe truck structureillustrated in Figures 9-11, Figure 12 being a plan 'view taken from the inner face 3Q, of the shoe', Figure 13 an end View looking downl fromv the top of Figure l2, and'Figure 14 a side elevation thereof. taken from the l'eft as seen in Figure 13.

Describing rst. the modication' illustrated in Figures; 1 8,` theVV side frame structure is of somewhat conventional truss type having the compression member 2, the tension member ll, the columnitsthe bolster opening 3u accommodating the bolster generally designated It' which may '10i bev supported as-uat l2, on the coil springs diagrammatic'ally indicated at llt, i4, said springs being positioned as` at' I'Sf onthe sprngseat portion of the side frame* in theusual 'manne-r. Ony thegcentral guide portion of the'column 6 may 4-5; be mounted' a Wear plate. t8- aording a vertical friction surfacefvvhchz may. bey engaged as at 2t by theL friction w'a'llsi-ZILZIl of the topiv and bot-V tom? identical irictionshoes generally` designated 22, 22. 5,0: Eachfriction; shoe isa cuplike structure having a centralzcavity' 2H; anditheoppose-dl cavities of respective'shoesfmay house the resilient member 216.2 which: may-be compressedy andf vulcanized betweengthei respective-shoes.. By this 'means the twoshoesrmay 'bev assembled together andh'andled' as a unit. Each friction shoe may have a. hori- Zontally arranged wedge face 28 and the wedge face of respective shoes of each pair may have rocking bearing as at 30 and 32 against the arcuate wedge faces 34 and 36, formed respectively on the top wall 38 and the bottom wall 40 `of the bolster.

The bolster may have the usual inboard and outboard gui-de lugs 4.2 and lili and intermediate said lugs at each side of the bolster the shoe pocket may be defined by inboard and outboard walls :i6 and d8, said walls together with the top and bottom walls 33 and 4Q and the bolster center rib 50 defining the friction shoe pocket 52.

The character of the arcuate wedge surfaces 34 and 36 may well be seen by a comparison of the views of Figures 4 and 5. These wedge surfaces on the bolster are so arranged as to permit wedge faces of the topi and bottom friction shoes 22, 22 to bear against the top and bottom walls of the bolster and have some rocking movement as well as sliding movement therealong, said rocking movement permitting each shoe to align itself properly against the adjacent side frame column as the side frame rocks with respect to the bolster and the slidable movement of the shoe along the wedge surface permitting normal movement of the bolster end longitudinally of the truck between the side frame columns.

The rear wall of each friction shoe may bear as at 54 against the spring plate 5B, said plate being a, rectangular plate, the opposite face of which may aiord a seat as at 58 for the resilient pad 60. 'I'he opposite side of the pad 00 may bear as at 52 against the bolster center rib 50 and said center rih- 50 may have an opening 64 centrally of the friction shoe pocket to accommodate a positioning lug 66 on the resilient pad 60. The top and Abottom contours of the pad 60 may bear as at 68 and 10, respectively, against the top and bottom walls of the bolster but the inboard `and outboard edges of said pads may be unconiined against expansion as may be seen in the plan view of Figure 2 where it may be noted that the lateral walls i6 and 48 of the bolster terminate short of the vertical center rib 50 of Ythe bolster so that expansion of the pad 60 is adjacent channel 1,2 so that between each pair,

of chanels 12 and 14 may be accommodated a pin 16, and the opposite ends of the pins 16, 16 may bear against the inner ends of the walls 46 and |18 as at 18, 1B (Figure 3) to hold the pad 60 under ,compression for purposes of assembling or dismantling the friction shoes.

The detail of the friction shoe is well illustrated in Figures 6, 7, and 8, said shoe being a cuplike structure of rectangular form having the bolster engaging wall 80 on the outer face 0f which may be formed the wedge face 28, already referred to.

In the modification illustrated in Figures 9-14, inclusive, the side frame structure may be generally similar to that of the previous modication, having the column |02 with the wear plate |04 on the bolster guide portion and against said wear plate may seat as at |06 the top and bottom identical friction shoes |08, |08, each of said shoes having the form illustrated in detail in Figures 12, 13, and 14, said shoes having on their adjacent faces opposed recesses forming a pocket within which may be confined and vulcanized a resilient pad l0 under compression between said shoes. As in the modification of Figure 1, the shoes and pad may thus form a unitary member. The respective shoes |08, |08 may have wedge faces in at face engagement as at i2 and H4, respectively, against complementary wedge faces formed on the top wall H6 and the bottom wall ||8 of the bolster, generally designated |20. In this modification the friction shoe pocket in the bolster may be defined by the inboard and outboard transverse bolster walls |22 and |24, by the boltser center rib |26, and by the top and bottom Walls of the bolster. The transverse bolster walls |22 and |26 may be adjacent the respective inboard and outboard guide lugs |28 and |30, and centrally formed in the walls |22 and |2 maybe the aligned openings |32, |32 for accommodation of a pin (not shown) which may be used to hold the friction shoes assembled within the pocket so that the bolster and the friction shoe assembly may be handled as a unit when the side frames are removed or applied. Each friction shoe may have aligned slots |34, |34 in the opposite walls thereof for accommodation of such a pin, and the resilient pad lili may have an opening |36 therethrough for the same purpose,

.The detail of the friction shoe used in this modification is shown in Figures 12, 13 and 14. Said shoe is generally rectangular in plan, as seen in Figure 12, with the friction wall |38 at the thick end of the shoe, side walls |40, |40, and a main wall |42 having on its cuter surface the wedge face |124 for seating against a complcmentary face on the bolster, |as already indicated.

It is to be understood that we do not wish to be limited by the exact embodiments of the device shown which are merely by way of illustration and not limitation as 'various and other forms of the device will, of course, be apparent t0 those skilled in the art without departing from the spirit of the invention or the scope of the claims.

We claim:

1. In a railway car truck, a side frame having columns, a bolster spring-supported from said frame with pockets adjacent `said columns, a friction shoe assembly in each pocket engaging the adjacent column, said assembly comprising top and bottom shoes in engagement with spaced walls of said bolster, resilient means vulcanized to said shoes and compressed therebetween for urging them into engagement with adjacent walls, and other resilient means operative to urge the shoes of each assembly into engagement with the adjacent column, said last-mentioned resilient means at opposite sides of said bolster having interengageable means for transmission of forces therebetween.

2. In a railway car truck, a side frame having spaced columns, a bolster spring-supported between said columns with a pocket adjacent each column, vertically spaced friction shoes vin each pocket bearing against the adjacent column and against top and bottom walls of the associated pocket, resilient means compressed between the shoes of each pair, a spring plate in each pocket `bearing against both shoes thereof, and other `resilient means compressed between respective plates and .a common wall of said bolster, said common vwall having an opening accommodating 'abutting portions ofv said last-mentionedV resilient means for transmittal of forces therebetween.

3. In a railway car truok, a sido frame having columns, a bolster spri-ngesupported from said frame withA pockets adjacent said columns, pairs of friction shoes in said pockets engaging said columns respectively, the shoes of each pair hav ing engagement with spaced-Wallsof said bolster, resilient means compressed between the Shoes of each pair` for urging' them into engagement with said walls, and other resilient means operati-ve to urge the shoes of each into engagement with the adjacent column.

4.. In a railway' cartruck-,- a supporting mem ber having. spaced columns; a member springsu-pportedbetween saidcolu-m'ns with a friction shoe pocket adjacent each column,- each of# said pockets being dened by spaced walls'- on sai-d supported member having friction shoe seats cli-verging toward the adjacent spaced frictionshoesi-n each pocket engaging the adjacent column andrespeotive-lyen,gf-agir;g.v 'said di verging seats, and resilient means compressed between said shoes, eac-hor saidsh-oes'- havidat face engagement with the adjacent seat.

5. In a rail-way carl-truck; a-

e fra-Ine having spaced columns, a bolsterspring-s-upported botwee-n said columnwith a pook-et adjacent each, vertically spaced friction shoesin each poe-liet bearingagainst the adjacent columnandagainst topn and bottom wallso-t the associ-ated pocket, resilient means compressed lbetween the shoes of each pair, a sj oring seat in eachpocket bean ing against both shoesthcreof, and other resilient means compressed between each seat and a spaced wall of saidbolsterg 6. In a railway car truck', a side frame having spaced columns, a bolster springesupnorted between said columns with a pocket adjacenteach column, vertically spaced, friction shoes in each pocket bearing against the adjacent column and against top and bottom walls ofthe associated pocket, resilient means compressed betweve the shoes oyf-A caer-r pair;A aspri-ngplatein each,v v .bearingagainstboth shoes thereof, other resilient mean-s compressed between respective plates and ar common wallx of saidjbolster.

' 7. Inabolster, a boxsec-tionendportion;hailing topand bottom walls, a vertical center rib, and vertical transverse walls at each side thereof terminating short of said rib and defining with said top and bottom walls friction shoe pockets, said top and bottom walls having opposed friction shoe seats arcuately arranged to accommodate rockable seating of associated friction shoes in a vertical plane transversely of said bolster.

8. In a bolster, a box section end portion defined by top and bottom walls, side walls, and a vertical center rib, friction shoe lpockets in each side of said bolster end intermediate the column guides thereof, each of said pockets being defined by transverse walls merging with said top and bottom walls, said center rib, and the adjacent side wall, and opposed friction shoe seats on said top and bottom walls in each pocket, said seats converging toward said center rib.

9. In a bolster, a box section end portion hav ing top and bottom walls, a vertical center rib, and vertical transverse walls at each side thereof terminating short of said. rib and defining with said top and bottom walls friction shoe pockets, each of said top and bottom walls having a wedge shaped friction shoe seat with an arcuate contour to permit imi-cking ofs'aidshoe in a vertical plane transversely of said bolster.

10. In a railway car'- truck, a supporting member having spaced columns, a member springe supported-'between said columns with -a friction shoe--pooket-adjacent each column,- each of said pockets being: defined in part by spaced substantialilyV horizontal top and bottom-'walls and spaced vertical walls extending therebetween, said top and bottom walls presenting opposed flaring iriction shoe seats extending between said vertical walls, a frictionshoe assembly mounted in. each 'pocket between saidf sea-ts and comprising top and bottom shoes, and resilient means intermediate said seats, and operatively associated with said shoes and operable to urge the latter into engagement with respective seats and into engagement with the adjacent column.

1.1.` In a railway car truck, a supporting member having spaced columns, a member springsupported between said columns with a friction shoe pocket adjacent each column, eachof said pockets being defined in part byy top` and bottom walls. having haring friction shoe seats of a width substantially equal to that of the pocket, a frictionshoe assembly mounted ineach pocket between said seats and comprising identical top and bottom shoes, and resilient means associated with said shoesand operable to urge said shoes into engagement with respective seats andinto engagement with the adjacent column, the shoes ofeachpair having coplanar friction surfaces abutting the adjacent column.

112;- In a railway car truck, a supporting mem ber having spaced columns, a member springsupported between said columns with a friction shoe pocket aol-jacent each column, each of said pockets bein-g defined i-npart by top and bottom wallspresenting diverging friction shoe seats exe tendingthewidth of the pocket, top and bottom friction shoes abutting respective seats andhaving-l coplanary friction faces for engagement with the adjacent column, and resilient mea-ns associated with and operative to urge said shoes into engagement with said seats and column,

i3. I-n a bolster, a box-section end portion having top and bottom walls, a vertical centerv rib andE vertical transverse walls at each side thereof terminating short of saidA rib and' defining with said top and' bottom walls friction shoe pockets, said topand bottom walls presenting opposed wedge-shaped convex friction shoe seats to accommodate rockable seating of associated friction shoes in a vertical plane transversely of said bolster.

14. In a bolster, a, box-section end portion having top and bottom walls, a vertical center rib and vertical transverse walls at each side thereof terminating short of said rib and defining with said top and bottom walls friction shoe pockets, said top and bottom walls presenting opposed reversely curved friction shoe seats arranged to accommodate rockable seating of associated friction shoes in a plane transversely of said bolster.

15. In a railway car truck, a side frame having columns, a bolster spring-supported from said frame with pockets adjacent said columns, each of said pockets being partly defined by top and bottom walls having arcuately arranged friction shoe seats, a friction shoe assembly mounted in each pocket between said seats and including a unitary shoe assembly comprising topand bottom portions, each of said portions having a plurality of angularly arranged relatively flat faces seated against respective seats, and resilient means associated with said shoes and operable to urge said faces into engagement with respective seats and other surfaces of said portions into engagement with the adjacent column.

16. In a railway car truck, a side frame having columns, a bolster spring-supported from said frame with pockets adjacent said columns, each of said pockets being partly defined by top and bottom walls having arcuately arranged friction shoe seats, a unitary friction shoe assembly in each pocket, each assembly comprising spaced top and bottom friction shoes dening a cavity therebetween, resilient means compressed between said shoes and housed in said cavity for urging respective shoes into engagement with adjacent seats and joined to respective shoes for retaining said shoes and resilient means in normal assembled relationship, a member in each pocket bearing against both shoes thereof, and other resilient means compressed between respective members and a common wall of said bolster for urging the associated shoes into frictional engagement with the adjacent column.

17. In a vehicle, relatively movable sprung and unsprung members, said unsprung member having portions embracing portions of said sprung member positioned therebetween, pockets in said portions of the sprung member with spaced internal arcuately arranged friction shoe seating surfaces, a friction shoe assembly in each pocket and comprising spaced friction shoes seated against said surfaces, resilient means compressed by and between said shoes for urging the latter against said surfaces, a member in each pocket abutting both shoes thereof, and other resilient means in each pocket and compressed between the rear thereof and the associated member for simultaneously urging the abutting shoes against the adjacent portion of said unsprung member, said surfaces permitting said shoes to adjustably position -themselves in substantially full face engagement with said adjacent portions of the un-- sprung member. Y j

18. In a railway car truck, a side frame having spaced column members, a bolster member interposed between said column members and spring-supported from said frame, pockets in one of said members adjacent the other of said members, each of said pockets having spaced curved friction shoe seating surfaces, a plurality of friction shoes in each pocket, each of said 4shoes engagingV a different surface, resilient means wholly housed and compressed between all of the shoes in each pocket and urging the same into said engagement, other resilient means seated against the rear of each pocket, andan element between said other resilient means and the shoes for transmitting forces from said other resilient means to the associated shoes for urging the latter into frictional engagement with the other of said members.

19. In a railway car truck, a side `frame with spaced columns, a bolster spring-supported from said frame with .pockets adjacent said columns, a pair of vertically spacedY friction shoes in each pocket, a resilient member compressed between each pair of shoes and urging them apart against adjacent walls of said pockets, and actuating means in each pocket simultaneously urging respective shoes into frictional engagement with the adjacent column.

20. In a truck, a side frame member, a bolster member supported therefrom, a friction surface on one member, the other member having a lpocket open to said surface, friction shoe seating faces at the top and bottom of said pocket extending the full width of said pocket and diverging toward said surface, a friction shoe assembly within said pocket comprising top and bottom shoes, respectively, slidably engaging said faces at the top and bottom of said pocket, and resilient means for urging said shoes against said faces and outwardly ofsaid pocket against said surface, said resilient means including a block of distortable material confined between said shoes and bonded thereto.

LEO A. LEI-IRMAN. HERBERT J. SCHMID.

REFERENCES CITED The Afollowing references are of record in the le of this patent:

UNITED STAIES PATENTS Number Name Date 2,141,680 Barrows Dec. 27, 1938 2,216,231 Dentler Oct. l, 1940 2,257,109 Davidson Sept. 30, 1941 2,366,973 Light Jan. 9, 1945 2,370,107 Light et a1. Feb. 20, 1945 2,378,415 Light June 19, 1945 2,424,936 Light July 29, 1947 

